#ifndef _FUNC_H_
#define _FUNC_H_
	#define LOWBIT(num) ((num) & -(num))
	#define ISDIGIT(ch) ((ch)>='0' && (ch)<='9')
	#define MAX(x,y) ((x)<(y)?y:(x))
	#define MIN(x,y) ((x)>(y)?y:(x))
#endif